basejails functionality and usage

[to...@chief.de]

Hi,

I started to play around with iocage for jail management a few days ago. It works excellently so far - therefore big thanks!

Installation was very easy and documentation is good for most uses (shared IP, templates) but I wasn't able to figure out how basejails are working. The documentation regarding this is a little bit slim.

The only thing I know is that they exist and can be created with the -b option and work a little bit different than that of ezjails. 

Could you please shortly explain the functionality and usage of basejails? What do they provide and share with other jails and how to create jails based on them?

Many thanks in advance

[Brandon Schneider]

Hey Torge,

So you are confusing templates and basejails a bit here. Let me try to unpack the concepts.

Templates - Use these to create jails from (including basejails), they funcion like a RELEASE for all intents and purposes

Basejails - These will nullfs mount all the necessary directories from a RELEASE to inherit any changes to that RELEASE (updates).  You could create a jail from a basejail if you set that basejail to a template. As for what they share, you can do iocage fstab -l JAIL to see which directories are shared exactly.

Here's a paste from my 'foo' jail:

root@freenas[~]# iocage fstab -lh foo

0       /mnt/tank/iocage/releases/11.2-RELEASE/root/bin /mnt/tank/iocage/jails/foo/root/bin nullfs ro 0 0

1       /mnt/tank/iocage/releases/11.2-RELEASE/root/boot /mnt/tank/iocage/jails/foo/root/boot nullfs ro 0 0

2       /mnt/tank/iocage/releases/11.2-RELEASE/root/lib /mnt/tank/iocage/jails/foo/root/lib nullfs ro 0 0

3       /mnt/tank/iocage/releases/11.2-RELEASE/root/libexec /mnt/tank/iocage/jails/foo/root/libexec nullfs ro 0 0

4       /mnt/tank/iocage/releases/11.2-RELEASE/root/rescue /mnt/tank/iocage/jails/foo/root/rescue nullfs ro 0 0

5       /mnt/tank/iocage/releases/11.2-RELEASE/root/sbin /mnt/tank/iocage/jails/foo/root/sbin nullfs ro 0 0

6       /mnt/tank/iocage/releases/11.2-RELEASE/root/usr/bin /mnt/tank/iocage/jails/foo/root/usr/bin nullfs ro 0 0

7       /mnt/tank/iocage/releases/11.2-RELEASE/root/usr/include /mnt/tank/iocage/jails/foo/root/usr/include nullfs ro 0 0

8       /mnt/tank/iocage/releases/11.2-RELEASE/root/usr/lib /mnt/tank/iocage/jails/foo/root/usr/lib nullfs ro 0 0

9       /mnt/tank/iocage/releases/11.2-RELEASE/root/usr/libexec /mnt/tank/iocage/jails/foo/root/usr/libexec nullfs ro 0 0

10      /mnt/tank/iocage/releases/11.2-RELEASE/root/usr/sbin /mnt/tank/iocage/jails/foo/root/usr/sbin nullfs ro 0 0

11      /mnt/tank/iocage/releases/11.2-RELEASE/root/usr/share /mnt/tank/iocage/jails/foo/root/usr/share nullfs ro 0 0

12      /mnt/tank/iocage/releases/11.2-RELEASE/root/usr/libdata /mnt/tank/iocage/jails/foo/root/usr/libdata nullfs ro 0 0

13      /mnt/tank/iocage/releases/11.2-RELEASE/root/usr/lib32 /mnt/tank/iocage/jails/foo/root/usr/lib32 nullfs ro 0 0

-Brandon

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[to...@chief.de]

Hi Brandon,

many thanks for your fast reply!

Yes you're right - I was a little bit confused about basejails and

templates and their differences. Think I got it now, it works similar

to ezjails which also use mount_nullfs(8).

I will keep on playing around with some testjails before put it in

production.

Keep on great work!

Best regards,

Torge

[Brandon Schneider]

Thanks Torge! Good luck :)

To view this discussion on the web visit https://groups.google.com/d/msgid/iocage/6868e608-7f73-4142-9738-68c0899ced3b%40googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

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-Brandon